Based on what little we know of the Time War, and various interesting fanfics, I have made a few decisions:
- The Neverweres and Meanwhiles were all the people who the Time War erased from history. The Could-HaveBeen King was the first one--the son that Koschei might've had if not for the drumming.
- The Nightmare Child was the Master himself. To the Daleks he probably was a nightmare, and he was driven mad as a child. When he returned on the Last Day the energies forming around him were vast enough that they made him look like a giant eating spaceships.
- The Horde of Travesties were people whose very biology had been twisted by the changes in time, devolved and re-evolved in strange ways. They were, however, time-aware enough to know what had been done to them, that they were in the wrong bodies, and they couldn't cope.
- The Skaro Degredations were obsolete--and often alternate--Daleks used as cannon fodder.
- The Master died four times, was the last survivor of three different squads, and was feared by both sides by the time he ran away.